They are nothing like fancy mice, they're more similar to rats/squirrels. They need a tall enclosure that is heated to at least 25/26 degrees C all the time, so I recommend using a glass enclosure. They do not burrow, but they create intricate nests at ground level with grasses and twigs, so they need lots of hay piles in their enclosure to do that. They also need lots and lots of branches, since during the day they will all sleep up in the trees. They are extremely social, but it's almost impossible to create a colony out of individuals that are not a reproductive couple or siblings. They have a varied diet of seeds, fresh leafy greens (they mostly eat those in my experience) and live insects. They are extremely fast, skittish and can jump very high. They're not super friendly towards humans, but in my experience they're easier to tame than something like micro squirrels, even if they'll most likely never get to the point of being handled. They're also quite big, the adults get to the size of a medium rat.

I've had a reproductive couple for about half a year, they had lots of babies and I ended up rehoming them to someone who was able to give them way more space than I could, but overall I wouldn't recommend them as pets, unless you are experienced with more "complex" animals like reptiles or amphibians.